Screw-cutting device.



NITED STATES `Peilinivr ormoni.

SAIVIUEL LIPPERT, OF CLEVELAND, OHIO, ASSIGNOR ONE-HALF TO JOSEPHSCHAUWEKER, OE CLEVELAND, OHIO.

SCREW-CUTTING DEVICE.

Specification of Letters Patent.

PatentedvDec. 1 1, 1906.

' Application iiled July Z8, 1905. Serial. No. 271,711.

To all L11/tom it may concern:

Be it' known that I, SAMUEL Lrrrnnr, a citizen ofthe United States, andaresident of Cleveland, county of Cuyahoga, State of Ohio, have inventedcertain new and useful Improvements in Screw-Cutting Devices, of which Ihereby declare the following to be a full, clear, and exact description,such as will enable others skilled in the art to which it appertains tomake and use' the same.

The invention has for its objects to provide a screw-threading device inwhich the cutting-dies can be arranged to cut a number of screw-threadsof different pitch and size of threads without removal fromtheir case orhandle containing them, this making a serviceable tool, light andconvenient for general use. I accomplish these objects by means ofrotatable cutter-dies, each provided with a plural number ofcutting-surfaces. The several surfaces of the dies are provided withcutting screw-threads, and the screw-threads vary in pitch and number ofthreads to the inch, so that as many dies are rovided and as many kindsof screw-three s can be cut therewith as there are cutting-faces orsides tothe dies.

`'Ihe invention consists in the portable case provided with handles andhaving rotatable or roller dies pivoted in the case. These roller-diesare polygonal, and leach side or face is provided with ascrew-cuttingdie, so that a plural number of dies is obtained thereby.

v The invention further consists in the guide adapted to support thework while passing through the dies, in means for securing the dies fromturning while operating in the work, and in means for adjusting theguides to inclose workof varying diameters `and to make the adjustmentof the guides relative to the size of the piece to be operated uponcoincident with the movement of the rotatable dies, so that when thedies are adjusted to cut a screw-thread upon a piece or rod of' givendiameter the guides will be also adjusted to clamp upon it and secure 1tfrom irregular movement.

The invention further consists in the combination and arrangement ofparts, as hereinafter described, shown in the above drawings, andspeciiically pointed out in the claims.

In the accompanying drawings, Figure 1 is a face view of the device,showing the guides in position and the bar which secures the dies frommovement. Fig. 2 is an edge view of the same. Fig. 3 is a transversesection of the device, taken on line a a, Fig. I, and on center line ofone of the roller-dies. Fig. I is a similar section, taken on line b b,Fig. l, through` one ofthe pins which support the bar and interlockswith the axial pins of the dies and prevents them from moving. Fig. 5 isa longitudinal section through Figjil, showing guides for the work andthe cams upon the `axial pins of the dies, which serves to adjust thedistance between the guides to correspond with the diameter of the workto be cut. roller-die, showing grooves in the end of the axial pin inwhich the edge of the retainingbar enters.

In these views, l is the case, having a handle 2 at each end. This caseis provided with an opening 3 in the center, in which the roller-dies 4are pivoted upon axial pins 5. The dies are shown to be octagonal, andin each face are sunk the cutting-teeth of a predetermined pitch andnumber to the inch, thus affording eight cutting-faces adapted to cuteight varieties of screw-thread. These Fig. 6 is an enlarged end view oftheV dies can be turned by hand to present the required correspondingfaces together, and the axial pins are provided each with diametricalgrooves 6 at one endl, soarranged as tolocate the position of thecutters and secure them from movement as soon as the retaining-bar 7 isinserted `in one of them. This bar is shown to be provided with an edge8, adapted to enter the grooves in the two adjoining axial pins whenthey are in alinement. The bar is secured to two pins S', which extendthrough transverse openings 9 in the case, and provided with nuts 10 attheir outer ends, which enter the enlarged portions 11 of the openings9. Springs 12 press against the nuts, and by pushing against the nutsthe bar can be liberated from the grooves in the axial pins. The nutsserve to retain the bar in place and also can be adjusted to giveexactly the right tension to make the operation of the bar mostconvenient. The guides 13 13 are adapted to hold the work while beingacted upon by the dies. A

A device is shown in Figs. 1, 3, and 5 for adjusting the space betweenthe guides simultaneously with turning the dies to pre- IOO sent newfaces to the work, since a screw of small diameter requires a iinerscrew-thread than one of a larger diameter. Hence the guides yshould becloser together when a small rod is to be cut than for a rod of largediameter. To accomplish this result, the guides are provided withinwardly-extending lugs or arms 14 and the axial pins of the dierollerswith cams 15, so that as the axes turn the cams willmove the guideslongitudinally upon the case and open and close them to correspond withthe cutters presented to the with the alined grooves of said axial pins,guides arranged to hold the work while operated upon, and mechanismcontrolled by the movement of said axial pins, for adjusting the openingbetween the guides, substantially as described. v

2. In a screw-cutting device, the combination with a case provided withan opening, of cutting-dies pivoted in said opening, and provided with aplural number of cutting-faces, axial pins therefor, guides slidablymovable upon said case, and adapted to receive the work acted upon bysaiddies, the said guides being provided with inwardly extending lugs,and cams on the axial pins adapted to engage said lu gs and to adjustsaid guides to the work relatively to the character of thecutting-faces, substantially as described.

In testimony whereof I hereunto set my hand this 15th day of July,1905-.

'SAMUEL LIPPERT.. Witnesses:

WM. M. MONROE, GEO. O. WILLET.

